BEAVIS' White Track Car

[beavis]

Blow the diffuser with the exhaust, 2011 F1 style!

Oh I wish. To be honest I don't even know where to start with that level of aero...

*...comments about paint...*

Thanks billy, really appreciate the comments. Sounds like i haven't done too badly then. I'm not going to bother with trying to work the paint any further, it's more than good enough, well at least for now.
All up I spent maybe $200-300 in materials to paint the roof. And I have half a can left to paint the doors. And a collection of new tools. I'm sure a pro shop would have asked much more $$$.

The stainless exhaust I have just made weighs a ton compared to my old one, which I made soley because I can weld SS.
I will run an aluminium exhaust again when I get better at welding the stuff.
Btw love the fastback... its getting me inspired to learn how to glass.

Thanks
Did you happen to get actual numbers on the weight difference? (Steel is typically about 2.5 times denser than aluminium. So a 10kg steel exhaust could be 4kg in Aluminium.)

Also, this is cool for anyone who's never seen it: http://www.motoiq.com/MagazineArticles/ ... nyway.aspx

[billybunter]

I think if any-one went to a paint shop and asked them could they spray the roof and doors for $200 to $300 they would probably say yes they could - BUT it would be with a hose! so you did well

like I said I only use acrylic but after I apply the last coat of white I usually run 4 coats of clear coat straight over it too. wait the next day and hit it with Norton 400 or 600 wet/dry light rubbing then use a very mild cutting agent.

Norton is by far the best paper ive use over 20 years that's why good paint shops carry it. not like that other rubbish which splits and cracks up in the rubbing blocks

after that then start on the car

[billybunter]

better still if any-one is using the wet/dry cutting paper for the first time best you go for 800/1000 grade.

[manga_blue]

Mocking up exhaust tip designs... This upturned style was one concept which got scrapped very quickly.
Notice however, I have angled the rear muffler upwards to make sure there is reasonable room for any rear underfloor work/diffuser.

Maybe you shouldn't scrap this straightaway. You did mention noise compliance earlier in the thread. I scrutineered an Alfa at Phillip Island that had a heavily angled tip like yours that could be rotated to face away from the sound monitor at whichever track he was competing on that day.

All up I spent maybe $200-300 in materials to paint the roof.

I wouldv'e done it for under $50 in Killrust.

[madjak]

I had that same vibrant muffler from that motiq article. It was super lightweight but I blew all the stuffing out of the exhaust whilst launching at the start of an autotest at a club event. It was raining fiberglass matting down from the sky.

It actually happened at around 4000 rpm where my exhaust is most violent from the cam overlap. The perferated mesh must have been flexing in and out from the exhaust pulses and cracked. On a stock car I think it would be fine although probably too loud.

[beavis]

Maybe you shouldn't scrap this straightaway.

I'm not quite ready yet to make my car look something like upside down gonzo from the muppets.

I had that same vibrant muffler from that motiq article. It was super lightweight but I blew all the stuffing out of the exhaust whilst launching at the start of an autotest at a club event.

I feel like hard launches are one of the more heavy-wear moments that a car would experience. Usually I would expect things like driveline that suffer... diff/trans/driveshafts for example. But I guess in your case it shows that other areas suffer too.

For now, a steel exhaust should be good and reliable for me.

[beavis]

Reduced Mass Makes The Car Faster

Sorry it's been a while since the last update... but plenty of stuff has been happenning.
So following from my removal of the boot floor (to make room for the exhaust), I continued the work with the grinder and cut out the remainder of the boot floor, that being the parts either side of the main frame rails in the boot where the battery usually lives on these cars.
In theory I could probably cut the frame rails out also, however, I thought it would be good to keep them for now, at least until the wing mount is worked out.


The other section I removed was the piece where the boot hinges usually bolt to, which lives between the passenger compartment and the boot area.


Not satsfied, I kept going with the grinder and took out the multiple layers of steel that lived above the rear wheel arches. There are about 4 layers of sheet metal here.
Sometimes it took a few passes with the grinder to take a layer off at a time to get the the next layer underneath.
And so many difficult hard to reach spots.


So much grinder dust and steel... and not looking forward to the cleaning that I will need to do.


The car is so much more open now, and the rear so easily accessible from the cabin.


While all external metal is still in place, you can really see how much of an 'airy' feel it has now.
I just wish I could shrink the fuel tank hump down now as it seems like a big lump in the way of what could be a big flat area.... MX-5 ute perhaps?


While I was on a roll, the seat mount hump thing on the drivers side of the car was drilled out and removed as the seat now bolts into the cage.


You can see the dash from the boot That's it for now....

[Okibi]

Fuel cell on the floor to your left to help balance the driver and remove that fuel tank hump?

[beavis]

Fuel cell on the floor to your left to help balance the driver and remove that fuel tank hump?

Not a bad idea Maybe one day in the future!

Actually, for the moment I wanna keep a passenger seat available as an option because sometime soon I want to bring the Mrs or my mum in the car and scare the crap outta them

[Apu]

What about just a smaller fuel tank in stock (lower) position. I have an 20L FCS fuel cell in my Integra, and a 5L surge tank. Enough for half a day at Wakefield.

[beavis]

I think 20l would be about right for me.... I will look at putting that on the long term to-do list

[beavis]

I should also add, in case you missed it, we've had a few interesting events around Melbourne recently which I managed to get the video camera out for.
Cars and Coffee 2016 at Sandown Raceway and Mazvember 2016 - check out the videos below

Also, a blatant plug for my youtube channel. If you like various things MX-5/Miata/cars you should probably subscribe https://www.youtube.com/bbeavis


Cars and Coffee 2016 at Sandown Raceway



Mazvember 2016

[sailaholic]

Not sure if you got to WTAC this year but it looked like under Suzuki had removed all the floor from about the drivers seat back to make a huge diffuser which came up why above diff height. Wait a sec I might have a photo.



Also any thoughts to increasing the strength of the safety cell around you given the strength and material removed from the rear.

Extra bracing between chassis rails to keep stiffness?


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[smy0003]

Is that an S15 or a catamaran?

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[speed]

Is that an S15 or a catamaran?

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I first read that as cateram.
Must have been sleeping when the s15 snuck up and ate it.

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